New Adapter: Digital Matter (#5617)

* New Adapter: Digital Matter

* Digital Matter: update doc

* fixes

couple of the metadata fields should be 'none' instead of 'false'. Fixed. Also fixed copy-paste error with company name.

---------

Co-authored-by: bretg <bgorsline@gmail.com>

dev-docs/bidders/digitalmatter.md

@@ -0,0 +1,39 @@
+---
+layout: bidder
+title: Digital Matter
+description: Digital Matter Prebid Bidder Adapter
+biddercode: digitalMatter
+pbjs: true
+pbs: false
+media_types: banner
+sidebarType: 1
+gvl_id: 1345
+tcfeu_supported: true
+usp_supported: false
+safeframes_ok: false
+prebid_member: false
+deals_supported: false
+floors_supported: false
+multiformat_supported: will-bid-on-one
+ortb_blocking_supported: false
+userIds: none
+fpd_supported: false
+schain_supported: false
+dchain_supported: false
+coppa_supported: false
+dsa_supported: false
+privacy_sandbox: none
+gpp_sids: none
+---
+
+### Note
+
+The Digital Matter bid adapter requires setup before beginning. Please contact us at <prebid@digitalmatter.ai>
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name        | Scope    | Description                             | Example         | Type     |
+|-------------|----------|-----------------------------------------|-----------------|----------|
+| `accountId` | required |  Account ID, provided by Digital Matter | `'123456'`      | `string` |
+| `siteId`    | required |  Site ID, provided by Digital Matter    | `'123-456-789'` | `string` |